Antenna system for microray signaling



Jan. 21, 1936. A. ca. CLAV|ER ANTENNA SYSTEM FOR MICRORAY SIGP IALING Filed Deb. 16, 1931 2 Sheets-Sheet l I I I l I l l l lNV ENTOR ANDRE G. CLAVIER BY @W ATTORN EY Jan. 21, 1936. CLFAVlER 2,028,498

ANTENNA SYSTEM FOR MICRORAY SIGNALING Filed Dec. 16, .1931 2 Sheets-Sheet 2 F|c.3- I

' INVENTOR want a. CLAVIER w A'ITORNEY Patented Jan. 21, 1936 UNITED STATE-S ANTENNA SYSTEM FOR. MICRORAY SIGNALING Andr G. Clavicr, Glen Ridge, N. J., assignor to International Communications Laboratories, Inc., Newark, N. J., a corporation of New York Application December 16, 1931, Serial No. 581,362

6 Claims. (01. 250-11) This invention relates to an antenna system for micro-ray signaling. By micro-ray signaling is meant the transmission and reception of intelligence by telephone, telegraph signals, or otherwise, on waves having a length approximately between the limits of 100 centimeters and one centimeter, although these limits may be exceeded in either direction.

In my copending application, Serial No. 576,972, filed November 24, 1931, a micro-ray signaling system is disclosed which, in a particular case, is operated in a wavelength of 18 centimeters. In that application it is disclosed that the antenna for the radiation or reception of waves in this range should be made of two linear radiating members, each a quarter wavelength long. In the particular case described in the copending application referred to each radiator would, consequently, be 4 centimeters long.

When the wavelength is changed it is desirable to change the length of the antenna in order to maintain this relationship.

The object of this invention isto provide means for adjusting a micro-ray antenna for difierent wavelengths.

In the operation of a micro-ray signaling system it is necessary that there shall be no obstructions between the transmitting and receiving antennae. In the copending application above-referred to I have disclosed a concentric transmission line connected between the antenna and the micro-ray tube, which permits the tube circuits, batteries, etc., to be mounted at a distance from the antenna. It is, therefore, possible to put these portions of the system inside a shelter where they will be protected from the elements, while the antenna is outdoors, or at least more exposed. Since the operator will be located inside the shelter, it is desirable that he be able to control all the adjustments of the system from this point.

A further object of this invention is to provide means for adjusting a micro-ray antenna from a remote point, that is, the point from which the other portions of the system are controlled.

In the drawings,

Fig. 1 shows diagrammatically a micro-ray antenna which may be adjusted as to length;

Fig. 2 shows diagrammatically means for controlling the antenna of Fig. 1 from' a remote point;

Fig. 3 shows another means of adjusting the length of a micro-ray antenna; and

Fig. 4 shows means for controlling the adjustment of the antenna of Fig. 3 from a remote point.

In Fig. 1 a reflector I has mounted at its focal point, which may be in the plane of the opening, an antenna consisting of the two antenna sections 2, 3. The antenna section 2 consists of an internally threaded tube 4 of conducting material, which may be copper, and an externally threaded tube 5 of the same material threaded within the tube 4. The antenna section 3 consists, similarly, of an internally threaded tube 6, of the same material as the other section of the antenna, and an externally threaded tube 1, also of the same material and threaded within the tube 6. The antenna sections 2 and 3 are oppositely threaded. Attached to the ends of the tubes 5 and l are insulating rods 8 and 9, respectively. These rods are slidably mounted in bearings I0 and II, which are secured to the edges of the reflector. An insulating wheel l2 has its hubs l3 and I4 secured to the inside ends of the sections 4 and 6, respectively. When the wheel I2 is turned, which may be done by hand, the sections 5 and I will turn in or out of sections 4 and 6. If the wheel is turned in such a direction that the antenna section 2 elongates, the antenna section 3 will also elongate, and vice versa.

In Fig. 2 a belt l6, which may be asilk thread, engages the wheel I2 of Fig. 1 and also engages a second wheel l1 inside the shelter, which may be turned by handle l8 to adjust the antenna from the remote point.

In Fig. 3 an alternative method of adjusting the antenna is shown. In this case one section of the antenna consists of a portion 24 and a portion 29. The portion 2!] slides within the portion 24. A spring 2| is secured to the portions 24 and 20 by screws 22 and 23, respectively, and is tensioned so that its efieot is to hold the two sections together. The other section of the antenna is arranged in the same manner. Insulating cords 25 and 26, which may be of silk or any suitable material, are attached to the ends of the inner tube comprising the antenna, and engage pulleys 21 and 28 secured to the edges of the reflector I. When the cords 25 and 26 are pulled the antenna elongates. When the pull is released the springs inside the antenna sections cause these sections to shorten.

In Fig. 4 the antenna system of Fig. 3 is shown, with the cords 25 and 26 passing into the shelter which houses the rest of the apparatus, where they are wound around a drum 3!! which is turned by handle 3| in order to produce the pull on these cords. Suitable means may be provided for maintaining the tension on the cords, so the adjustment of the antenna will remain fixed.

What is claimed is:

1. In combination with a parabolic reflector, an antenna having two telescoping sections mounted at the focal point of said reflector, a rectangular cross-sectioned insulation member fixedly secured at one end to one of said sections and at its other end to said reflector by means of a bearing permitting axial movement while preventing rotation thereof, a second section screw-threaded to said first sectionand having a wheel mounted thereon to effect its rotation, and means associated with said sections adapted to micrometrically increase or decrease their effective lengths by the rotation of said second-named section effecting axial movement of the first-named section.

2. In combination with a parabolic reflector, an antenna comprising a pair of radiating elements disposed at the focal point of said reflector, each element comprising two telescoping screw-threaded sections, insulating means mounted on said reflector and engaging the inner members of said elements so as to permit axial movement of said members while preventing rotary movement thereof, and means secured to the outer members of said elements for causing simultaneous rotary movement of said outer members thereby to move said inner members axially.

3. In combination with a parabolic reflector, an antenna comprising 'a pair of radiating elements disposed at the focal point of said reflector, each element comprising two telescoping screwthreaded sections constituting driving and driven members, insulating means mounted on said reflector and engaging said driven members so as to permit axial movement thereof whilst preventing rotary movement thereof, and said secured to the driving members for causing simultaneous rotary movement thereof thereby to move said driven members axially.

4. In combination with a parabolic reflector, an antenna comprising two telescoping members having screw-threaded engagement, and mounted at the focal point of said reflector, means supported by said reflector and engaging the inner member of the telescoping sections so as to permit axial movement of said inner member while preventing rotation thereof, and means secured to the second member for preventing its axial movement and including means for imparting a rotational movement thereto thereby to cause axial movement of said first named member.

5. In combination with a parabolic reflector, an antenna comprising two telescoping members having screw-threaded engagement and mounted at the focal point of said reflector, means supported by the reflector and engaging one of said members so as to permit axial movement while preventing rotation thereof, and means secured to the other member for preventing its axial movement and including means for imparting rotational movement thereto thereby to cause axial movement of said one of said members.

6. The combination according to claim 5 and in which said means supported by the reflector is of insulating material.

ANDRE G. CLAVIER. 

